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5 Loc3 Series Transmitters
200 kHz direct connection
1 watt (depending on region)
Direct connection: 256Hz, 491Hz, 982Hz, etc
Direct and clamp connection: 8.19 kHz, 8.44 kHz, 9.5 kHz, 9.82 kHz, 32.8 kHz, 38 kHz
Some other frequencies with 1W output: 89 kHz, 131 kHz, 200 kHz
1 watt (depending on region)
Clamp connection: any frequency from 8 kHz up to the highest allowed frequency (depending on region).
Induction Frequency: Induction frequencies start at 8kHz. Above 8kHz the range of frequencies is the same as direct connection
(highest available frequency depends on local transmitter regulations).
NOTE:
See section 5.4.2 for the frequency activation procedure.
200kHz
131kHz
83.1kHz
65.5kHz
32.8kHz
8.19kHz
Pushbutton
Pushbutton
As with most manufacturers the clamps and induction antennas are tuned to specific frequencies, and do not work over the
complete range of frequencies.
Frequencies are selected by pressing the “f” pushbutton which toggles through the available frequencies for the selected mode.
The frequency is automatically selected if you don’t toggle past it within two seconds. The frequency is shown on the display.
NOTE:
The output current is shown in large characters on the display – to increase or reduce the current output press “+” or “-”. The
vertical bar graph at the bottom of the display indicates which of the six current output steps is being used. If the transmitter can
supply the requested current, the bar will turn black. If the bar does not turn black, improving the ground connections or wetting
the ground where the earth stake is positioned, may help. However, it may not be able to achieve the current setting requested
because the impedance of the line is too high for this setting. If this happens it is best to select a lower setting that has a black
bar, this will ensure a stable output.
The current being transmitted will be limited by the impedance of the target line, therefore it is not unusual to increase the output
level, but see no increase in the current displayed. This is not a fault with the transmitter.
The transmitter will always revert to first level output when switched on – this is a power-saving feature – in most circumstances
this output level is sufficient. Increasing the output power unnecessarily will reduce the battery life. All other settings remain the
same as the last setting used.
5.4.2 Most Used Frequencies (Frequency Selection) Feature
This feature can be used to allow the operator to choose the most used frequencies from a list of possible frequencies. Once
these frequencies are selected in the main menu, by pressing the “f” pushbutton, the user can scroll through them. At any
time the user can add or remove frequencies from the above list, by following the below procedure. The maximum number of
frequencies that can be activated in the most used frequencies list is 12.
The advantage of this feature is that user can work with only their preferred frequencies, instead of having a whole list of
frequencies to scroll through.
